Book I: PowerPC User Instruction
Set Architecture

Book II: PowerPC Virtual
Environment Architecture

This book defines the additional instructions and facilities, beyond those
of the PowerPC User Instruction Set Architecture, that are provided by the
PowerPC Virtual Environment Architecture. It covers the storage model,
related instructions and facilities available to the application
programmer, and the Time Base as seen by the application programmer.

Book III: PowerPC Operating
Environment Architecture

This book defines the additional instructions and facilities, beyond those
of the PowerPC User Instruction Set Architecture and PowerPC Virtual
Environment Architecture, that are provided by the PowerPC Operating
Environment Architecture. It covers instructions and facilities not
available to the application programmer, affecting storage control,
interrupts, and timing facilities.

Additional information may be provided in other books that describe a
particular processor implementation. Such books may describe approaches to
obtaining the best performance, the results produced when a software error
is encountered, and so forth.